Transcend 256GB 2.5" SATA III MLC SSD320. Solid-state drive capacity: 256 GB, Size: 63.5 mm (2.5 "), Solid-state drive interfaces: Serial ATA III. Read speed: 560 MB/s, Write speed: 530 MB/s, Random write (4KB): 87000 IOPS. Security algorithms supported: 128-bit AES. Operating temperature range (T-T): 0 - 70 °C, Operating relative humidity range: 10 - 90 %. Weight: 95 g, Depth: 99.8 mm, Width: 69.8 mm